To investigate this, you should collect the sniffer traces from call manager and h323 gw. You need to find, how long does it takes for setup to reach phone and before call manager gets the connect message. it could be delay on pstn side.
... View more

Hi, Please collect the following tarces: debug h225 asn1 debug h245 asn1 debug voip ccapi inout Please log all of this to the router's buffer with these commands: config t service timestamps debug datetime local msec service timestamps log datetime local msec service sequence no logging console no logging monitor no logging rate-limit no logging queue-limit logging buffer 3000000 debug After turning on the debugs, issue the command "clear log". Then reproduce the issue. After that, dump the contents of the log using: term len 0 show log
... View more

default dialpeer is dialpeer 0, it matches by default if there is no other incoming dialpeer is matched. whenever call hits the GW, it matches incoming dialpeer , it can be from CUCM or PSTN. we need incoming dialpeer to define the codec and dtmf digits. DID is required for incoming POTS dialpeer.
... View more